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Definition of tenor for English Language Learners. : the highest adult male singing voice; also : a singer who has such a voice.
The medium female singing voice in opera and non-classical music (although in the choir, the mezzo-soprano and the contralto are lumped together as altos). The mezzo-soprano has a range of two octaves from A3 (below middle C) to A5 (just two notes short of high C). This is the most common female voice.